Senate Majority Leader Harry Reid didn't think he had enoughsupport for his debt-ceiling proposal, yet he pushed ahead Sunday with calling on the Senate to vote on his plan. The Senate predictably failed to advance his debt ceiling legislation.

With 43 Republicans pledging to vote against his plan, it was clear Reid wouldn't get the needed 60 votes to overcome a Republican filibuster in the Senate.

Still, Reid, a Democrat, remained "cautiously optimistic" a deal could be reached.

In fact, Reid actually voted "no" on his own bill, in an effort to keep the underlying bill alive to bring back later if and when an agreement is reached for the anticipated deal between the White House and Congressional leaders.

"Optimism in days past has been really stomped on at times," Reid said. "As we know, one problem can stop the whole agreement."

The Senate could return to vote on the plan Sunday evening if an agreement is reached.

Meanwhile, Senate Republican leader Mitch McConnell said Sunday negotiators are "very, very close" to a deal to raise the debt ceiling, beating the Aug. 2 deadline.

Some Democrats however, are talking in a more cautious tone. The deal is not yet done, they say.

As McConnell announced in two interviews over the weekend that a deal is close, Sen. Chuck Schumer, D-N.Y., told CNN there is a sense of relief in Washington that progress is being made but that "there is no final agreement" yet on the table.

Schumer later told CBS in an interview Sunday that one of the final sticking points between Republican and Democrat leaders is the creation of a "trigger" mechanism that would strike at priorities of both parties if the bipartisan committee does not come up with a plan for further deficit reduction.

Trigger proposals being discussed include automatically reducing spending on entitlement programs including Medicare along with closing tax loopholes or reducing defense and non-defense programs by an equal amount.

"It should be equally tough on Democrats and Republicans," Schumer said.

But even though final details remain in discussion, McConnell talked Sunday as if a deal would be passed before the Aug. 2 deadline to raise the U.S. debt ceiling.

Congress has been working around the clock to meet the fast-approaching deadline to ward off a first-ever government default, and the Senate prepared Sunday to convene in a rare session to address the issue.

McConnell, R-Ky., said progress was made late Saturday in discussions between the White House and congressional leaders on a debt-ceiling plan that could find enough support from both Democrats and Republicans to get an agreed upon plan to President Barack Obama by the Aug. 2 deadline.

On CNN's "State of the Union," McConnell talked about a $3 trillion plan that includes cuts in federal discretionary spending, a vote on a balanced budget amendment, and caps on future spending.

The plan would also form a joint committee to consider additional budget cuts and entitlement reforms that Congress could vote on in the fall, in addressing America's $14 trillion budget deficit.

If approved, the plan would raise the debt ceiling, now at its limit, until after the 2012 presidential election. But even though progress has been made over the weekend, it's not done yet.

"This deal has not been finalized, but I think we're very, very close to something I could comfortably recommend to my members, and I believe the Democratic leadership will be doing the same," said McConnell, on CBS' "Face the Nation."

Sen. Dick Durbin of Illinois, the No. 2 Democrat in the Senate, expressed similar optimism about getting a deal done.

"I have a much more positive feeling than I did 24 hours ago," Durbin told Fox News Sunday.

Lawmakers came under intense public pressure Friday as no deal was in sight and U.S. and global markets dropped in response to America's financial uncertainty. China and other countries, as well as U.S. banks and companies, have called upon lawmakers to reach agreement so the U.S. doesn't default, possibly sending the nation back into another recession.

David Plouffe, senior advisor to Obama, said Sunday morning that Republican and Democratic leaders in discussions "still have some work to do."

"We're talking about a variety of options here," Plouffe said.

He added that if negotiators do not reach an agreement by Tuesday, the day of the deadline to raise the debt ceiling, the White House would consider raising the debt ceiling for a day or two to work out final plan details.